The new integrated biological approach against Black Vine Weevil
Pitcher GR
IPM Planning
Pitcher GR Use within IPM systems Monitoring Application guidance
Use within an IPM system Pitcher can be used alongside other biological controls to control Vine weevil Allow a minimum of 6 weeks after application of Pitcher before applying beneficial nematodes. Before applying Nematodes ensure the correct species is selected based on soil/media temperature data. (Consult ICL for temperature sensor information) Use week numbers to keep track of applications of Pitcher and beneficial nematodes. Save all data collected for review later in the season to monitor success levels.
Susceptibility of ornamental plant species to vine weevil larvae
Conifers Susceptible Cupressocyparis (leylandii)
Pinus+
Juniperus
Taxus*
Rarely attacked
Thuja Trees and shrubs Susceptible
Rarely attacked
Azalea*
Hydrangea*
Pyracantha*
Amelanchier
Cytisus
Nerium
Calluna*
Kalmia
Rhododendron*
Aucuba
Eleagnus
Olearia
Camellia*
Laburnum
Ribes+
Berberis
Fagus
Philadelphus
Chaenomeles+
Malus
Rosa
Brachyglottis
Genista
Pittosporium
Cornus
Parthenocissus
Skimmia*
Buddleia
Hebe
Prunus laurocerasus
Cotoneaster
Photinia*
Viburnum*
Buxus
Hypercium
Ribes
Daboceia*
Pieris*
Vitis
Ceanothus
Ilex
Salvia
Erica*
Populus
Wisteria
Choisya
Lavender
Sambucus
Euonymus*
Potentilla
Cistus
Ligustrum
Spiraea
Fuchsia*
Prunus lusitanica*
Cordyline
Lonicera
Symphoricarpus
Corylus
Mahonia
Vinca
Weed hosts of vine weevil
*
Adult feeding also seen
This table represents information gathered from an industry survey undertaken in 2010 and from key research studies, it is reproduced for the purposes of guidance and should not be considered a definitive and exhaustive list ofsubjects.
A number of weed plant species are also susceptible to vine weevil including: Dandelion (Taraxacum spp.) Docks (Rumex spp.) Knotweeds (Polygonum spp.) Plantains (Plantago spp.) Willowherbs (Epilobium spp.) These plants can act as food sources for either larval or adult vine weevil or both.
Susceptibility of ornamental plant species to vine weevil larvae
Herbaceous perennials Susceptible
Rarely attacked
Achillea+
Digitalis
Paeonia
Acanthus
Eryngium
Pansy
Allium
Epimedium*
Phlox
Ajuga
Erysimum
Penstemon
Artemisia+
Ferns
Polygonum
Alchemilla
Euphorbia
Persicaria
Aster
Francoa
Primula*
Aquilegia
Helenium
Pulmonaria
Astilbe
Geranium
Rheum
Astrantia
Helianthemum
Rudbeckia
Begonia*
Geum
Rumex
Coreopsis
Hemerocallis
Salvia
Bergenia*
Gladiolus
Saxifrage
Crocosmia
Leucanthemum
Verbascum
Campanula
Heuchera
Sedum
Dahlia
Lupinus
Veronica
Chrysamthemum
Heucherella
Sempervivum
Delphinium
Nepeta
Viola
Convallaria*
Hosta
Tellima
Echinacea
Osteospermum
Cyclamen
Iris
Tiarella
Dahlia
Lilium
Verbena
Dianthus
Liriope
*
Adult feeding also seen
Pitcher and Seeka treatment decision tree
Are plants to be treated produced in house ?
Yes
No
Adult Are adults ,eggs or larvae evident
Yes
Adults apply Pitcher. Larvae apply Seeka or Seeka CT
No
Continue weekly monitoring and treat if pest reappears
Monitor for Vine weevil in growing area
Quarantine and check for Vine weevil
Details for Pitcher and Seeka are available on the ICL website www.icl-protect.com
Move to growing area , monitor and treat if pest reappears
Adults apply Pitcher. Larvae apply Seeka or Seeka CT
Are adults, eggs or larvae evident
Eggs Yes
Stay in quarantine until treated
No
Move to growing area continue weekly monitoring treat if pest reappears
Larvae
Nematode applications Pitcher can be used alongside beneficial nematodes as previously explained ICL can advise on the correct species to use from the Seeka range and help with environmental monitoring with temperature sensors placed within the growing media.
The use of a compatible penetrant such as Transporter is key to maximise efficacy levels Ongoing monitoring of the Vine weevil population is paramount to ensure timely, targeted applications of Pitcher and Seeka are successful
Typical example: Heuchera (Own stock) Week 17: Apply Pitcher at 12g/m2 to freshly potted plants into 10cm pots .
Week 24: Apply Seeka Vine weevil as media temperature is 14 degrees Centigrade. Continue with normal monitoring and applications of sprays for adult Vine weevil through the summer. The use of adult traps is recommended Week 36: Apply Pitcher at 12g/m2 if adults are present.
Week 42: Monitor situation and Apply Seeka Vine weevil or Seeka CT if media temperature is below 12 degrees C to protect crop over the Autumn period.
Example 2: Cyclamen (Plug plants) Week 24: Plants received & checked. Potted into 10.5cm pots
Treat with Seeka Vine weevil. Week 30: Adults found in traps and Pitcher applied at 24g/m2 Week 37: Continued monitoring has resulted in low population of larvae in crop. Treat with Seeka Vine weevil. Week 46: Plants destined for Christmas sales and possibility of larvae in crop. Treat with Seeka CT as temperature data from Sensors indicate media temperature 10 degrees C. Monitor through to marketing.
Adult trap
Example 3: Taxus 9cm liners (under protection) Week 40: Plants received, quarantined and treated with Seeka CT
Week 46: Plants potted into 17cm pots. Adults found in traps . Treat with Pitcher at 12gms/m2 Monitor through the winter checking adult traps and pots for larvae. Week 10: Evidence of low population of larvae. Treat with Seeka CT as temperature sensor data shows media temperature of 9 degrees C.
Week 17: Adults found in traps. Treat with Pitcher at 12gms/m2 and continue to monitor . Week 27: Evidence of larvae found. Treat with Seeka Vine weevil as media temperature 15 degrees C.
Application
Pitcher GR
➢ Foliage should be dry before commencing application ➢ Dislodge any granules in foliage following application
➢ Irrigate thoroughly ➢ Ensure growing media does not dry out completely as this will restrict the release pattern of Pitcher ➢ Clean out application equipment thoroughly and ensure any unused granules are either distributed over a suitable crop or returned to the original product bag
Application ➢ Application of Pitcher should be as even as possible based on the recommended rates.
Example : Spread pattern on 17cm pot applied at 24g/m2
Application Application can be made in a number of ways: ➢ Gloved hand for small areas
➢ Shaker pots for small areas ➢ Spinning disc applicator ➢ Motorised blower applicator Application needs to be as accurate as possible based on recommended Rates to achieve maximum efficacy
Available application equipment :
Spinning disc applicator
Powered applicator
Rate tables: Pitcher has a maximum individual dose of 240kg/Ha per crop per calendar year. Meaningful suppression has been demonstrated at 120Kg/Ha.
The table below provides rates for various application areas. Pitcher application area
Rates
Square Metre
12-24 grams
100 square metres
1.2 – 2.4 Kg
1 Hectare (10,000 m2)
120 – 240 Kg
Rate table for various pot sizes ( Rate based on pots being pot thick per m2): Pot size
Rate per pot @ 240 Kg/Ha
9cm
0.195g (123 /m2)
10cm
0.24g (100/m2)
10.5cm
0.26g (83/m2)
11cm
0.289g (82.6/m2)
12cm
0.345g (69.4/m2)
15cm
0.541g (44.3/m2)
20cm
0.96g (25/m2)
25cm
1.5g
(16/m2)
Nematode applications temperature choice
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